I ran a best of 12.969 @106.54 on saturday at lebanon valley. First run wasn't bad 13.400 @102.60 1.997 60', this is the way I drive it every day, Second run I put a screw in the carb to make my vacuum secondaries mechanical. 13.299@104.12 2.011 60', lots of pinging in 2nd and 3rd. Third run, 12.969 @106.54 1.991 60', hooked nice and pulled strong. I was pretty happy overall with my performance. This is on a totally stock rear suspention with stock 2.73's and Futura 255/50 ultra Z's. Next is 3.73 9" and slicks to help the traction. Will my mph go up with the 3.73 or stay the same? Do any of you know how fast I could go with the 106 mph?

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86 Iroc, 383 Ported Sportsman II, Ported RPM Airgap, 750 Holley Vac. Sec., Slp 1 3/4, Comp Cams roller 218 224, 10" 2600 stall, Fairbanks 700r-4 W/superflow pro pump, 2.73 posi 87 K30 Chevy P/U 355 TPI TH400, headers and 2 1/2 duals, flowmasters, 8" lift, 36" super swampers, 4.10 detriot lockers all the way around

 

You put a screw in your carb? Tell me more I'm interested.

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Cosmik Debris

 

I put a 10 32 screw in the linkage so when you get to 1/2 throttle it opens the secondaries. It goes on the half-round part of the drivers side. I felt a big difference on the butt dyno but if you get into it too quick it will bog big time

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86 Iroc, 383 Ported Sportsman II, Ported RPM Airgap, 750 Holley Vac. Sec., Slp 1 3/4, Comp Cams roller 218 224, 10" 2600 stall, Fairbanks 700r-4 W/superflow pro pump, 2.73 posi, 12.969@106.54 1.991 60' 9" 3.70, slicks, and full suspention in the works
87 K30 Chevy P/U 355 TPI TH400, headers and 2 1/2 duals, flowmasters, 8" lift, 36" super swampers, 4.10 detroit lockers all the way around